Which roasting characteristic can affect the coffee's flavor profile negatively?

The choice of "too dark of a roast" accurately reflects a roasting characteristic that can negatively impact the coffee's flavor profile. When coffee beans are roasted too darkly, they often develop an overwhelming bitterness and a charred flavor that can mask the inherent qualities of the beans. This can lead to a loss of the origin flavors that contribute to a coffee's unique taste profile.

In contrast, lighter roasts are known for highlighting distinct fruity or floral notes, while medium roasts offer a balanced flavor that often preserves some of the original characteristics without overpowering them. Additionally, freshly roasted beans, while they may require some time to rest to achieve optimal flavor, are generally associated with vibrant flavors and aromas, making them desirable rather than detrimental. Thus, roasting coffee too darkly tends to overshadow its complexity and freshness, which is why this characteristic is seen as negatively affecting the overall flavor profile.